On the front page of the catalogue Chemist Warehouse is offering a $10 cashback on Wartner. A product that freezes warts for removal.
From what I gather you purchase it for $12.99 grab your claim form instore, fill it in and and send it off to receive the $10 cash back. Therefore it only costs you $2.99 (plus a stamp probably). Suggested retail price is $26.99.
Here's some info I gathered on the product:
there's no mention of the cashback offer on their website, but looking at the hardcopy it's stated on the front page.